单项选择题


A．atmosphere
B．gas
C．aerial
D．liquid
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单项选择题
A．observableB．observedC．observantD．observing
A．observable
B．observed
C．observant
D．observing
单项选择题
The best title for the last part of the passage is _______.
A．Spas are good for your health.
B．Spas for all reasons.
C．Spas are like Starbucks.
D．Start doing spas right now.
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